It doesn't. Glass is designed to project the image at far-focus, so if you have good eyesight or corrective lenses (like me) that allow you to see in the dista

It doesn't. Glass is designed to project the image at far-focus, so if you have good eyesight or corrective lenses (like me) that allow you to see in the distance, there is no need to re-focus to see the image. http://www.extremetech.com/extreme/131877-ive-seen-the-future-hands-on-with-google-glass http://www.extremetech.com/extreme/131877-ive-seen-the-futur...